Question

What is the pipelining technique? How does this technique improve the performance of multicore processor so that multimedia applications could run on microcomputers at high speed?

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Answer 1

Pipelinig technique :

• Pipeline is the process of arrangement of hardware elements of CPU such that its overall performance is increased.
• Simultaneously execution of more than one instruction takes place in pipelined processor
• In pipelining multiple instructions are overlapped in execution

In a pipelined processor, a pipeline has two ends, the input end and the output end between these ends, there are multiple stages or segments. such that output of one stage is connected to input of next stage and each stage perform specific operation

• Interface registers(latches or buffer) are used to hold the intermediate output between two stages.
• All the stages and interface registers in the pipeline are controlled by a common clock

Types of Pipeline :

1.Arithmetic pipeline:

• It is mostly found in all the computer
• They are used for floating point arithmetic operations, multiplication of fixed point numbers
• Arithmetic pipeline can be applied to various complex and slow arithmetic operation to speedup the processing time.

2.Instruction  pipeline:

• In instruction pipeline is a stream of instructions can be executed by overlapping fetch, decode and execute phases of an instruction cycle
• This type of pipelining is used to increase the performance of multicore processor

Advantages of pipelining:

1. more efficient use of processor that will help to improve the performance of multicore processor so that multimedia applications run on microcomputers at high speed
2. It increase the throughput of the system
3. It can save circuitry

Imrove the performance of processor:

• Arithmetic pipeline can be applied to various complex and slow arithmetic operation to speedup the processing time.
• instruction pipelining is used to improve the performance of CPU

The basic idea is to split the processor instructions into a series of small independent stages. Each stage is designed to perform a certain part of the instruction. At a very basic level, these stages can be broken down into:

• Fetch Unit Fetch an instruction from memory
• Decode Unit Decode the instruction be executed
• Execute Unit Execute the instruction
• Write Unit Write the result back to register or memory

Super pipelining, Superscalar, and Very Long Instruction Word (VLIW) are techniques developed to improve the performance

Super pipelining improves the performance by decomposing the long latency stages (such as memory access stages) of a pipeline into several shorter stages, thereby possibly increasing the number of instructions running in parallel at each cycle.